The pulse frequency noise of magnetars and persistent accretion powered pulsars

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2021-2-03

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Serim, Danjela

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In this thesis, the pulse frequency fluctuations of magnetars and six selected persis-tent accreting powered pulsars (PAPPs) are presented. Using the data fromRXTE,XMM-Newton, Chandra, SwiftandFERMIobservatories, the timing noise behav-ior of individual sources on various timescales are examined, depending on the datasampling rate of input frequency measurements. The timing noise amplitudes are an-alyzed via two separate methods, namely∆8andr.m.smethods. The timing noisecharacteristics of both magnetars and PAPPs are investigated together with a sampleof 366 radio pulsars obtained from literature. The relations of timing noise behaviorwith the physical quantities are examined with an aim of exploring the origin of thenoise process in different source samples. The focus of the study is to understand thetiming noise behavior of magnetars and accretion powered pulsars. The results showthat there is a connection between timing noise behavior of magnetars and radio pul-sars, in fact they form a continuum. Furthermore, the timing noise in magnetars donot exhibit footprints of accretion. On the other hand, PAPs display a rather distinc-tive timing behavior that is induced by inhomogeneities in the accretion flow. Hence,the results of this study suggests that timing noise of magnetars originate from the extreme magnetic field strengths and outburst activities.

Subject Keywords

Magnetar, Timing noise, X-ray timing, Acceting pulsars

URI

https://hdl.handle.net/11511/89675

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

D. Serim, “The pulse frequency noise of magnetars and persistent accretion powered pulsars,” Ph.D. - Doctoral Program, Middle East Technical University, 2021.